How many times would it take jason and janet to mow the lawn together?

Question

Jason can mow a lawn in 1 hour and janet can mow the same lawn in 45 minutes.

Answer 1

How much gets done in one hour?

 

1/1 + 1/(0.75) = 1/m

 

Once we find and apply the LCD, we don't need it, just the numerators.

 

3m + 4m = 3

7m = 3

m = 3/7

 

(3/7)60 = 180/7 = 25 5/7 mins 

 

(5/7)60 = 300/7 ≈ 43 seconds

 

25 mins, 43 secs